Flow dynamics in blood vessels of a few hundred microns in diameter were investigated using Doppler optical coherence tomography (DOCT) and Doppler Amplitude optical coherence tomography (DAOCT), a novel extension of DOCT. The motivation behind this work is discussed, followed by a brief explanation of the theory underlying the motion of blood cells in small conduits and blood vessels. Preliminary results are presented and compared to the predictions expected from theory. All significant findings are analysed along with their importance to microvascular research.